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Active Merchant is a simple payment abstraction library used in and sponsored by Shopify. It is written by Tobias Luetke, Cody Fauser, and contributors. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
http://activemerchant.org

README.md

Active Merchant

Active Merchant is an extraction from the e-commerce system Shopify.
Shopify's requirements for a simple and unified API to access dozens of different payment
gateways with very different internal APIs was the chief principle in designing the library.

It was developed for usage in Ruby on Rails web applications and integrates seamlessly
as a Rails plugin, but it also works excellently as a stand alone Ruby library.

Active Merchant has been in production use since June 2006 and is now used in most modern
Ruby applications which deal with financial transactions. It is maintained by the
Shopify and Spreedly teams, with much help
from an ever-growing set of contributors.

See GettingStarted.md if you want to learn more about using Active Merchant in your
applications.

Installation

From Git

You can check out the latest source from git:

git clone git://github.com/Shopify/active_merchant.git

From RubyGems

Installation from RubyGems:

gem install activemerchant

Or, if you're using Bundler, just add the following to your Gemfile:

gem 'activemerchant'

Usage

This simple example demonstrates how a purchase can be made using a person's
credit card details.